Effects of Fe partial substitution of La 2 NiO 4 /LaNiO 3 catalyst precursors prepared by wet impregnation method for the dry reforming of methane

A promising method to reduce global warming has been methane reforming with CO2, as it combines two greenhouse gases to obtain useful products. In this study, Ni-supported catalysts were synthesized using the wet impregnation method to obtain 5%Ni/Al2O3(SA-5239), 5%Ni/Al2O3(SA-6175), 5%Ni/SiO2, 5%Ni/MCM41, and 5%Ni/SBA15. The catalysts were tested in dry reforming of methane at 700 °C, 1 atm, and a space velocity of 39,000 mL/gcat h, to study the interaction of Ni with the supports, and evaluation was based on CH4 and CO2 conversions. 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 gave the highest conversion of CH4 (78 and 75%, respectively) and CO2 (84 and 82%, respectively). The catalysts were characterized by some techniques. Ni phases were identified by X-ray diffraction patterns. Brunauer–Emmett–Teller analysis showed different surface areas of the catalysts with the least being 4 m2/g and the highest 668 m2/g belonging to 5%Ni/Al2O3(SA-5239) and 5%Ni/SBA15, respectively. The reduction profiles revealed weak NiO-supports interaction for 5%Ni/Al2O3(SA-5239), 5%Ni/MCM41, and 5%Ni/SBA15; while strong interaction was observed in 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2. The 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 were close with respect to performance; however, the former had a higher amount of carbon deposit, which is mostly graphitic, according to the conducted thermal analysis. Carbon deposits on 5%Ni/SiO2 were mainly atomic in nature.

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The Effect of CeO2 and Fe2O3 Dopants on Ni/ Alumina Based Catalyst for Dry Reforming of Methane to Hydrogen

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.364.519 ◽

2011 ◽

Vol 364 ◽

pp. 519-523 ◽

Cited By ~ 1

Author(s):

S. Sivasangar ◽

Yun Hin Taufiq-Yap

Keyword(s):

Catalytic Activity ◽

Vital Role ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Impregnation Method ◽

Environment Friendly ◽

Fuel Gas ◽

Wet Impregnation ◽

Temperature Programmed ◽

Temperature Programmed Reaction

Methane reforming is the most feasible techniques to produce hydrogen for commercial usage. Hence, dry reforming is the environment friendly method that uses green house gases such as CO2and methane to produce fuel gas. Catalysts play a vital role in methane conversion by enhancing the reforming process. In this study Ni/γ-Al2O3was selected as based catalyst and CeO2and Fe2O3dopants were added to investigate their effect on catalytic activity in dry reforming. The catalysts synthesized through wet impregnation method and characterized by using XRD, TEM and SEM-EDX. The catalytic tests were carried out using temperature programmed reaction (TPRn) and the products were detected by using an online mass spectrometer. The results revealed that these dopants significantly affect the catalytic activity and selectivity of the catalyst during reaction. Hence, Fe2O3doped catalyst shows higher hydrogen production with stable catalytic activity.

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Performance Analysis of TiO2-Modified Co/MgAl2O4 Catalyst for Dry Reforming of Methane in a Fixed Bed Reactor for Syngas (H2, CO) Production

Energies ◽

10.3390/en14113347 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3347

Author(s):

Arslan Mazhar ◽

Asif Hussain Khoja ◽

Abul Kalam Azad ◽

Faisal Mushtaq ◽

Salman Raza Naqvi ◽

...

Keyword(s):

Catalytic Activity ◽

Fixed Bed ◽

Catalytic Performance ◽

Dry Reforming ◽

Fixed Bed Reactor ◽

Dry Reforming Of Methane ◽

Catalyst Stability ◽

Feed Ratio ◽

Catalyst Loading ◽

Impregnation Method

Co/TiO2–MgAl2O4 was investigated in a fixed bed reactor for the dry reforming of methane (DRM) process. Co/TiO2–MgAl2O4 was prepared by modified co-precipitation, followed by the hydrothermal method. The active metal Co was loaded via the wetness impregnation method. The prepared catalyst was characterized by XRD, SEM, TGA, and FTIR. The performance of Co/TiO2–MgAl2O4 for the DRM process was investigated in a reactor with a temperature of 750 °C, a feed ratio (CO2/CH4) of 1, a catalyst loading of 0.5 g, and a feed flow rate of 20 mL min−1. The effect of support interaction with metal and the composite were studied for catalytic activity, the composite showing significantly improved results. Moreover, among the tested Co loadings, 5 wt% Co over the TiO2–MgAl2O4 composite shows the best catalytic performance. The 5%Co/TiO2–MgAl2O4 improved the CH4 and CO2 conversion by up to 70% and 80%, respectively, while the selectivity of H2 and CO improved to 43% and 46.5%, respectively. The achieved H2/CO ratio of 0.9 was due to the excess amount of CO produced because of the higher conversion rate of CO2 and the surface carbon reaction with oxygen species. Furthermore, in a time on stream (TOS) test, the catalyst exhibited 75 h of stability with significant catalytic activity. Catalyst potential lies in catalyst stability and performance results, thus encouraging the further investigation and use of the catalyst for the long-run DRM process.

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Nickel-based perovskite catalysts: synthesis and catalytic tests in the production of syngas

Cerâmica ◽

10.1590/0366-69132018643712329 ◽

2018 ◽

Vol 64 (371) ◽

pp. 436-442 ◽

Cited By ~ 3

Author(s):

E. O. Moraes Júnior ◽

J. O. Leite ◽

A. G. Santos ◽

M. J. B. Souza ◽

A. M. Garrido Pedrosa

Keyword(s):

Impregnation Method ◽

X Ray Diffraction ◽

Organic Precursor ◽

Wet Impregnation ◽

Partial Oxidation Reaction ◽

Conversion Level ◽

Temperature Programmed ◽

Perovskite Type ◽

Wet Impregnation Method ◽

H2 Selectivity

Abstract La1-xSrxNiO3 (x= 0.0, 0.3 or 0.7) perovskite-type oxides were synthesized using the modified proteic gel method and using collagen as an organic precursor. Catalysts of La1-xSrxNiO3/Al2O3 were obtained using the wet impregnation method. The synthesized catalysts were characterized by X-ray diffraction, surface area and temperature-programmed reduction. The catalysts were evaluated in the partial oxidation reaction of methane, and the levels of selectivity to CO, CO2, H2 and H2O were determined. Among the catalysts studied, the catalyst LaNiO3/Al2O3 had the highest methane conversion level (78%) and higher H2 selectivity (55%).

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Catalytic Activity Of Cu/η-Al2O3 Catalysts Prepared From Aluminum Scraps In The NH3-SCO and in the NH3-SCR of NO

10.21203/rs.3.rs-550091/v1 ◽

2021 ◽

Author(s):

Nawel Jr ◽

Thabet Makhlouf ◽

Gerard Delahay ◽

Hassib Tounsi

Keyword(s):

Catalytic Oxidation ◽

Catalytic Reduction ◽

Impregnation Method ◽

Wet Impregnation ◽

Reduction Of No ◽

Evaporation Method ◽

Nh3 Scr ◽

Scr Of No ◽

Selective Catalytic Oxidation ◽

Wet Impregnation Method

Abstract Copper loaded η-alumina catalysts with different copper contents have been prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV–vis, H2-TPR and evaluated in the selective catalytic reduction of NO by NH3 and in the selective catalytic oxidation of NH3. The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu(1)-Al2O3 and Cu(2)-Al2O3. The latter justifies the similar behavior of Cu(1)-Al2O3) and Cu(2)-Al2O3 in the selective catalytic oxidation of NH3 where these catalysts exhibit a conversion of NH3 to N2 of the order of 100% at T > 500°C.

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Effect of CNTs Support Diameter on Pt Particles Size and Distribution

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.119.231 ◽

2007 ◽

Vol 119 ◽

pp. 231-234

Author(s):

Yong Hwan Kim ◽

Yon Ki Seo ◽

Young Rae Cho ◽

Kwang Ho Kim ◽

Won Sub Chung

Keyword(s):

Electrochemical Impedance ◽

Pt Catalyst ◽

Impregnation Method ◽

Wet Impregnation ◽

Optimum Diameter ◽

Electro Oxidation ◽

Average Size ◽

Wet Impregnation Method ◽

Xrd And Tem ◽

Supported Pt Catalyst

The Platinum catalysts on the carbon nanotubes(CNTs) supports of various diameters were prepared by wet impregnation method using H2PtCl6 precursor. The samples using 100nm, 15~20nm, 10~15nm and 5~10nm diameters of CNTs and carbon nanofibers(CNFs) are named Pt/t- CNFs, Pt/MWNTs20, Pt/MWNTs10 and Pt/MWNTs5, respectively. The effects of CNTs diameter on the Pt particle size and distribution were investigated by the means of powder XRD and TEM observation. In addition, the electro-catalytic characteristics for methanol electro-oxidation were estimated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. The average size of Pt particles increases as follows; Pt/MWNTs10 < Pt/MWNTs5 < Pt/MWNTs20 < Pt/t-CNFs. The electro-catalytic characteristics of Pt/MWNTs10 and Pt/MWNTs20 are found to be superior in comparison with the others. For preparation of the most effective supported Pt catalyst, the optimum diameter of CNTs support in the range of 10-20nm, is needed.

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Preparation of Cr Metal Supported on Sulfated Zirconia Catalyst

Materials Science Forum ◽

10.4028/www.scientific.net/msf.948.221 ◽

2019 ◽

Vol 948 ◽

pp. 221-227

Author(s):

Latifah Hauli ◽

Karna Wijaya ◽

Ria Armunanto

Keyword(s):

Sulfated Zirconia ◽

Reduction Process ◽

Catalyst Preparation ◽

Impregnation Method ◽

Wet Impregnation ◽

Zirconia Catalyst ◽

Isotherm Adsorption ◽

Sulfated Zirconia Catalyst ◽

Adsorption Desorption ◽

Wet Impregnation Method

Catalyst of Chromium (Cr) metal supported on sulfated zirconia (SZ) was prepared by wet impregnation method. This study aim to determine the optimal concentration of Cr metal that impregnated on SZ catalyst. Preparation of catalyst was conducted at different concentrations of Cr metal (0.5%, 1%, 1.5% (w/w)), impregnated on SZ catalyst, then followed by the calcinationand reduction process. Catalysts were charaterized by FTIR, XRD, XRF, SAA, TEM, and acidity test. The results showed the Cr/SZ 1% had the highest acidity value of 8.22 mmol/g which confirmed from FTIR spectra. All the crystal phase of these catalysts were in monoclinic. The specific surface area increased with the increasing of Cr metal concentration on SZ catalyst and the isotherm adsorption-desorption of N2 gas observed all the catalysts as mesoporous material. The impregnation process formed particles agglomeration.

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{CeO2/Bi2Mo1−xRuxO6} and {Au/Bi2Mo1−xRuxO6} Catalysts for Low-Temperature CO Oxidation

Catalysts ◽

10.3390/catal9110947 ◽

2019 ◽

Vol 9 (11) ◽

pp. 947 ◽

Cited By ~ 2

Author(s):

Edson Edain González ◽

Ricardo Rangel ◽

Javier Lara ◽

Pascual Bartolo-Pérez ◽

Juan José Alvarado-Gil ◽

...

Keyword(s):

Co Oxidation ◽

Photoelectron Spectroscopy ◽

Supported Catalysts ◽

Pollutant Emissions ◽

Impregnation Method ◽

Wet Impregnation ◽

X Ray ◽

Low Temperature Co Oxidation ◽

Carbon Dioxide Co2 ◽

Wet Impregnation Method

Nowadays, one of the most important challenges that humanity faces is to find alternative ways of reducing pollutant emissions. CeO2/Bi2Mo1−xRuxO6 and Au/Bi2Mo1−xRuxO6 catalysts were prepared to efficiently transform carbon monoxide (CO) to carbon dioxide (CO2) at low temperatures. The systems were prepared in a two-step process. First, Bi2Mo1−xRuxO6 supports were synthesized through the hydrothermal procedure under microwave heating. Then, CeO2 was deposited on Bi2Mo1−xRuxO6 using the wet impregnation method, while the incipient impregnation method was selected to deposit gold nanoparticles. The CeO2/Bi2Mo1−xRuxO6 and Au/Bi2Mo1−xRuxO6 catalysts were characterized using SEM microscopy and XRD. Furthermore, energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were used. Tests were carried out for the supported catalysts in CO oxidation, and high conversion values, nearing 100%, was observed in a temperature range of 100 to 250 °C. The results showed that the best system was the Au/Bi2Mo0.95Ru0.05O6 catalyst, with CO oxidation starting at 50 °C and reaching 100% conversion at 186 °C.

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Deep oxidative desulfurization of model fuels catalysed by immobilized ionic liquid on MIL-100(Fe)

RSC Advances ◽

10.1039/c9ra03035b ◽

2019 ◽

Vol 9 (38) ◽

pp. 21804-21809 ◽

Cited By ~ 1

Author(s):

WanXin Yang ◽

Guoqing Guo ◽

Zhihong Mei ◽

Yinghao Yu

Keyword(s):

Ionic Liquid ◽

High Efficiency ◽

Oxidative Desulfurization ◽

Impregnation Method ◽

Wet Impregnation ◽

Wet Impregnation Method

ILs@MIL-100 composites were synthesized via the wet impregnation method and applied in deep oxidative desulfurization of gasoline with high efficiency.

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CeO2 nanodots decorated ketjen black for high performance lithium–sulfur batteries

RSC Advances ◽

10.1039/c6ra24156e ◽

2016 ◽

Vol 6 (112) ◽

pp. 111190-111196 ◽

Cited By ~ 17

Author(s):

Xinye Qian ◽

Lina Jin ◽

Lin Zhu ◽

Shanshan Yao ◽

Dewei Rao ◽

...

Keyword(s):

High Performance ◽

Impregnation Method ◽

Wet Impregnation ◽

Lithium Sulfur Battery ◽

Lithium Sulfur Batteries ◽

Sulfur Battery ◽

Wet Impregnation Method ◽

Lithium Sulfur

A CeO2 nanodots decorated ketjen black composite was fabricated by a simple wet impregnation method and used as the host of sulfur for a lithium–sulfur battery.

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